If the focus of an ellipse is $(-1,-1)$, equation of its directrix corresponding to this focus is $x+y+1=0$ and its eccentricity is $\frac{1}{\sqrt{2}}$, then the length of its major axis is

If the normal drawn at the point $(2,-1)$ to the ellipse $x^{2}+4 y^{i}=8$ meets the ellipse again at $(a, b)$, then $17 a=$

If the locus of the centroid of the triangle with vertices $A(a, 0), B(a \cos t, a \sin t)$ and $C(b \sin ,-b \cos t)$ ( $t$ is a parameter) is $9 x^{2}+9 y^{2}-6 x \overline{\bar{x}} 49$, then the area of the triangle formed by the line $\frac{x}{a}+\frac{y}{b}=1$ with the coordinate axes is